It would be interesting to remove the crank and bottom bracket and see if the seat and/or down tube and see what's happening inside. When you're examining a frame, it's impossible to check every possible joint for things like braze penetration and proper mitering, but this is one area where you can.
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If someone tells you that you have enough bicycles and you don't need any more, stop talking to them. You don't need that kind of negativity in your life.